|[Boatanchors] RE: [AMRadio] Tower Construction|
collinsradio at adelphia.net
Tue Jun 13 07:33:55 EDT 2006
I appreciate all the email on this subject.
Interestingly, when lightning rods were placed on barns all over this
country, I cannot recall any barn in our region ever catching on fire
because of a lightning strike. I am sure that it did happen in other
regions, particularly, in the Midwest/ The installation was to run a very
large conductor cable from the lightning rod to the ground. There were
generally two rods on either end of the roof. I would theorize that a
lightning strike should be directed to a ground rod placed a few feet from
the tower rather than to travel under the base of the tower as some have
suggested. I am going to ground the tower at the three legs with a copper
strap and then to a ground rod about 3 feet from the tower.
Also, the Empire State Building and other skyscrapers get struck many times
during a thunder storm and I wonder if anyone knows if the lightning travels
through the superstructure or through cables/straps to the base of the
building and through ground rods.
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----- Original Message -----
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Stevan A. White'" <w5saw at pathwayz.com>; "'Discussion of AM Radio'"
<amradio at mailman.qth.net>; <boatanchors at mailman.qth.net>
Sent: Monday, June 12, 2006 10:10 PM
Subject: [Boatanchors] RE: [AMRadio] Tower Construction
> Be careful when giving this advice.
> A UFER ground is a good SUPLEMENTAL ground in a tower base but it should
> be the only ground. A large area like a floor of a building provides more
> surface for the lightning to dissipate. A tower concrete foundation may
> be large enough by itself and there is the possibility of poor connections
> inside so that the concrete crack from a lightning strike if it is the
> ground connection. It is always recommended that ground rods be attached
> each tower leg in addition.
> Gary K4FMX
>> DO RUN THE GROUND THROUGH THE CONCRETE! Take a look at the information
>> this site first though. You may be glad you did.
>> Best Regards,
>> Steve White, W5SAW
>> SW Commercial Electronics
>> -----Original Message-----
>> From: Ed Swynar [mailto:gswynar at durham.net]
>> Sent: Saturday, June 10, 2006 2:16 PM
>> To: Discussion of AM Radio; boatanchors at mailman.qth.net
>> Subject: Re: [AMRadio] Tower Construction
>> Hi Dave,
>> I have a 48' tall, tapered, self-supporting "Delhi"-brand tower --- 6
>> sections at 8' long each.
>> The prescribed / manufacturer's recommendation is to bolt a 3' straight
>> formed extention at the base of each leg (total of 3), & to "suspend"
>> (a temporary wooden "cradle" will do admirably, as the cement sets) in a
>> hole dug 4' square, & 4-1/2' deep --- the cement is to come but a few
>> below the bottom legs of the actual tower section.
>> Oh yes --- the bottom 1' of the square hole is to be "belled" outward a
>> foot, or so.
>> The documentation says this is good for heights of up to 64', or
>> never gone beyond 48', & have never, EVER had an ounce of trouble in the
>> locations that I've had my tower up.
>> BTW, the top of the tower as an old Cornell-Dubelier AR-44 rotator, & a
>> 3-element Hy-Gain TH3 MkIII triband yagi...
>> Use "industrial"-grade coarse cement, & do NOT run any ground leads
>> the block itself!
>> ~73~ Eddy VE3CUI - VE3XZ
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